Multiplying-gearing



E. C. HEAD.

MULTIPLYING GEARING.

APPLICATION FILED NOV. 10. 1911.

Patented Sept. 13, 1921.

4 SHEETS-SHEET 1.

A n omwsr 5 E. 0. HEAD.

MULTIPLYING GEARING. APPLICATION mzuuov. 10, 1911. 1,390,905,- PatentedSept 13, 1921.

4- SHEETS-SHEET 2.

nrromvns E. C. HEAD. MULTIPLYING BEARING. APPLICATION FILED NOV. 10, 1911.

4 SHEETSSH EET 3.

' I C. [AWE/1! ATTORNEYS- Patented Sept. 13, 1921.

or waitrgoaxo, assfonon r comsuan mhcnmr. TooL com-j 1 gmg qg rimnsinvanra, apconiroaarron or rEnNsYLvANIA.

mutrrrnrmc-emnme To i i Be itwkuown that:I,1ERNnsr G; a citizen 1 ofthe United'States of America,

F l and aresident of Van Wert, Ohio, have in-- vented a. new and useful Improvement in MultiplyingvGearing, which invention1 is full set. forth in the following specification.

is invention relates to gearing for mu1- M 1 tiplying the ratiostheretofore obtained by of the invention proceeds. 1 1

the use of'change-speed-gearing, and is of especial'xutility'fl when applied to the, multiplying of the feed ratiosof 1a machine tool; obj ect oftliisl'ihvention is to prov de, t :17 in combination with change-speed gearing,

gearing for multiplying the ratios obtainable thereby which occupies ibutlittle space and is simple in? construction, while obtaining a greater rangeof ratios orvariationszof speed 1: than has heretoforebeen-secured." 111 1 1 1 Another object of this invention; is to pro-v vide ear-ingot the type characterizedwith" readi y-niamp1ilated operating mechanism. Other objects wi'll appear as the description Stated broadly, the inventiom comprises, incombination with; a pluralityaof gears constituting change-speed gear ng of any suit.

able construction and operatively related to:

produce-1 a plurality of: feed ratios 1 or "variations in speed, a werm and worm wheel and means to selectively coinneca or interpose said Worm and swarm-Wheel in train with said feed ratios .of' a 'mabhine tOOlyb 1 a rela-' tively large 1'ratio,;rand "comprises a ternative r gear trains, one of which includes saidworm and worm-wheel, togetherwith means of any suitable construction 1 for connecting either of said alternative gear1tra1ns in1tra1nwrth said change-speed geanng. 1 1

11The invention is? capable of receivingja varietyof mechamcal expressions, one 1 of which is; shown on the accompanying draw, ings, but it is 't'obe expressly understood that the drawingsare for purposes of-illustratlon only and are nottobe construedas a definitioll of the limitsof the invention, reference being had to the appended claims for that purpose. 1 1 ipsaidd wingsa-f q ,7 =1 11" 1 1 1: Figure -11? ois a werticallsect on through a v i ififi o tr L'et'tersiateu Patented Sept. 13,1921. Application filed November 10, 1917.1 Serial No. 201,243.

gearbox containing multiplying gearing in accordance with the present invention; 1

Figj 2 is a front elevation of said box;

1 Fig. 3 is an end elevation of said box;

- Fig gt is a detail of the key "operating mechanism; Y

.Eig. 15 is afront elevation of an assembly of said gear box with a feed box containing change-speed gearing of a machine-tool. Fig; 6 is a diagrammatic view of said changeespeed gearing. Referring in detail to said drawings,

wherein; the same reference characters are used to designate corresponding parts in the,

of change-speed gearing ,of any suitable construction, such for example as that disclosed in my application Serial'No. 201,245, filed November 10, 1917, wherein a plurality ofgears are operatively related to produce eight variations of feed. The driving shaft for said change-speedgearing is indicated at? and, in' the form shown of gears 30, 31 are mounted thereon in position to mesh selectivel with shiftable gears 32, 33 on a shaft 34:. lso mounted on shaft 3411s asecond pair of shiftable gears 35, 36 adapted to mesh selectively with gears 37 38 on shaft 39. Shaft 39 also carries a third gear 40, and mounted on a shaft 411 in position to mesh selectively with gears 38 and 40am a pair of shiftable gears 42, 43. Shaft 41-1 drives the shaft l heretofore referred to. 1

4 1designates a housing for the multiplying gearingq of this invention, and within said housing 4.- and mounted upon (Fig. 6), a pair r thedriving shaft 5 is the drive gear 6 for 1 other suitable type of: gears. Connected to or integral with said gear 7 is a .spunor.

other suitable gear 9 which meshes with a second similar 7 gear I 10'1mounted vupon the tubular shafti'll for free rotation'thereon'. Shaft 11 is connected to the shaft?) inany suitable'way, as by a spline or feather 12 engaging a. seat in the shaft 3. Also mounted' onshaft'5 is afworm 13 which meshes sition designated S on said plate, the pinion 24 will be rotated to reciprocate rack 20 andthereby stem 16 to engage key with worm-wheel 14. The drive of shaft 3 will now be from shaft'5 through'worm 18 and iwormewheel 14;. Inasmuch as in the with a worm-wheel 14 alsomountednfor free.

rotation upon the tubular shaft 11. Spur I gear 10r-andeworrn wheel; 14 are adapted to,

1 reciprocate in the longitudinal slot -17 providedv-in the shaft ll. Said key 15 is nor-' mally urged'outwardly, toengage in either be selectively-connected with the shaft 11,-

to drive the same,-by any-suitable-device. In the form.v shown, asliding key 15'is mountedin arecess in the stem 16 and can one or the :other ofthe keyways provided inz spur gear 10 and worm-wheel l i, by the spring 18, and to prevent said key from en-' gaglngin more than one-of said keyways at once, said key is-beveled at its corners and a ring 19 is provided'intermediatethe gear membefslO and lei-to camsaid key against I the tension of-the spring 18 toa position flush with' theysu'rface of the shaft 11 until said key isinalinement with the keyway ofone or theother OfStLlCl gear members.

[Suitable mechanism is provided to shift the stem 16 and therebyreciprocate the key 15and, in: the form shown, a longitudinally slidablerod 20-is .mounted in the box 4 and'connected to said stem 16} by an arm21, the forked end-"22' of which engages a head 23 onsaid stem l6. Said rod 20'is provided The spur. gears 9 and 10 are here shown as being of; equal pitch diameter, thereby having a ratio ofone to one, but this ratio may obviously be varied-as conditionsrequire. The worm transmission hasa ratio of one to sixteen, but this ratio has been seleeted only as being suitable to a particular case and maybe varied as desired.

In operation,shaft 1 is driven through the change-speed gearing provided in the feed box 2, said'chan'ge-speed gearing in turn being driven by shaft 3. When key 15 is engaged with spur gear 10, the drive, of shaft 3 is from shaft '5 throughmiter gears6 and 7-and spur gears 9 and 10. The interposition of thesegears in the train of feed gearing: secures the feed ratios normally obtainable by the change-speed. gearing in thefeed box; By'rotation-of the hand-wheel-26 so astof move pointer 27 from the position designated FZ on;the-face plate 28 to the poex ampletaken said worm and worm-Wheel have the ratio of one to sixteen, all of the feed ratios obtainable by actuation of the gears in..the..feed.b0x;2 will now be multiplied by the same ratio of one to sixteen.

It will thereforebeseen that a very simple structure has been provided for multiplying the feed ratios orvariations of speed heretofore obtained by theuse of change-speed gearing and one that occupies a minimumof space. In fact, a pair of spur or other similar gearsfor multiplying by a relatively large ratio would occupy so much space as to prohibitv their use, since the diameters of the gearswouldhave to be in proportion to the multiplying ratio desired. It will also be observed that very simple and convenient means have been providedfor interposing either of the alternative gear trains in the train of. gearing.

-While the multiplying gearing has been shown as interposed in the feed train on the drivingside of the change-speed gearing, this position is not necessary and, in fact, said multiplying gearing could be interposed in the train of feed gearing on the driven side of the change-speedgearing with equal:

facilityand with the-securing of the same functions and advantagedv Furthermore, it is to'be expressly understood that the ratios of gearing illustrated on'the drawings and referred toherein have been selected for purposes of illustration only.

While the :embodimentof the invention shown on the drawings has been described with considerable particularity, it is to be expressly understood that the invention is not to be restricted to the form here shown for it is capable of receiving a variety of mechanical expressions, some of which will readily suggest themselves to those skilled in the art, while certainfeatures of the in vention are capable of use without other fea-- tures thereof. Reference is therefore to be had to the claims hereto appended for a definition of the limits of the invention.

What is claimed is 1. In a train of feed gearing comprising a plurality of gearsoperatively related to produce a plurality of feed ratios, means to multiply said feed ratios comprising alternative gear trains one of which includes a worm and worm-wheel, a gear of each of said trains being freely rotatable on a common shaft, and a sliding key for connecting either of said last-named gears with said shaft to selectively interpose either of said gear trains in said trainof feed gearing 2.;In a train of feed gearing comprising a worm and worm-wheel, a gear of each of said trains being freely rotatable on a common shaft, a sliding key for conneotin either of said last-named gears wlth sai shaft to selectively interpose either of said gear trains in said train of feed gearing, and means to prevent the engagement of said key with more than one of said gears.

3. In a train of feed gearing comprising a plurality of gears operatively related to produce a plurality of feed ratios, means to multiply said feed ratios comprisin alternative gear trains one of which inc udes a worm and worm-wheel, a gear of each of said trains being freely rotatable on a common shaft, a sliding key for connectin either of said last-named gears with sai shaft to selectivel interpose either of said gear trains in said train of feed earin 1aind a rack and pinion for reciprocating said 4 In a train of feed gearing for machine tools comprising a plurality of gears operatively related to produce a plurality of feed ratios, means to multiply said feed ratios by a relatively large ratio comprising alternative gear trains one of which includes a worm and worm-wheel, a gear of each of said trains being freely rotatable on a common shaft, and means for connecting either of said gears with said shaft to selectively interpose either of said gear trains in said train of feed gearing.

5. In a train of feed gearing comprising a plurality of gears operatively related to produce a plurality of feed ratios, means to multiply said feed ratios comprising alternative gear trains one of which includes a worm and worm-wheel, a gear of each of said trains being freely rotatable on a common shaft, a sliding key for connecting either of said last-named gears with said shaft, a rack parallel to said first-named shaft and connected to said sliding key, a pinion for reciprocating said rack, and an indicating hand-wheel for rotating said pinion.

In testimony whereof I have signed this specification.

ERNEST 0. HEAD. 

